T-dwarf companions to exoplanet host stars?

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T-dwarf companions to exoplanet host stars?

Post by Edasich on 6th February 2014, 3:05 pm

This one seems having passed unnoticed.

A Mid-Infrared Search for Substellar Companions of Nearby Planet-Host Stars

The most of the candidate companions seems like unbound sources or artifacts but three would be intriguing if confirmed, since late T-dwarf whose mass range lies within upper limit of planetary domain (25 MJup).

- 47 UMa B (or "47 UMa e") a = 300 AUs
- Gliese 581 B (or "Gliese 581 g" or just "e" not accounting e and f planet candidates) a = 150AUs
- HD160691/Mu Arae B (or "Mu Arae f") a = 300 AUs


"Gliese 581 B" seems to lay in planetary regime with a putative mass between 7 and 10 MJup.
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Re: T-dwarf companions to exoplanet host stars?

Post by tommi59 on 7th February 2014, 10:06 am

So this is gliese 581 f planet at 150 AU nice but not this one I expect from this system
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Re: T-dwarf companions to exoplanet host stars?

Post by Lazarus on 7th February 2014, 6:25 pm

Well considering that these aren't known to be actual members of these systems, giving them "B" designations seems a bit premature. Probably better to stick with the candidate numbers used in the paper: 47 UMa-1, HD 160691-8, GJ 86-1, GJ 581-3.

47 UMa-1 has a >3σ difference in proper motion so is unlikely to be bound.
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